KR101085084B1 - Run flat tire - Google Patents

Abstract

The present invention relates to a run-flat tire, wherein the run-flat tire which reinforces the inner side of the sidewall portion of the pneumatic tire with a reinforcing member so as to be able to travel when the internal pressure is lowered, wherein the reinforcing member is inside the sidewall portion adjacent to the tread portion. A first reinforcing part attached to the upper side; A second reinforcement part which is disconnected at a distance from the first reinforcement part and attached to a lower side of the sidewall part adjacent to the bead part; And a third reinforcement part connecting a first reinforcement part and a second reinforcement part interposed between the first reinforcement part and the second reinforcement part in a height direction central portion of the sidewall part, wherein the third reinforcement part is provided in the first reinforcement part. The reinforcing portion and the elastic member having a lower rigidity than the second reinforcing portion, it is possible to improve the riding comfort in everyday life, while maintaining durability when lowering the internal pressure abnormality such as puncture of the run-flat tire.

Run-flat tire, reinforcement member, reinforcement ring, coil spring

Description

RUN FLAT TIRE}

The present invention relates to a run-flat tire, and more particularly, to a run-flat tire reinforced with a sidewall to enable the driving even when the tire is lowered beyond the internal pressure such as puncture and to improve the riding comfort.

As is well known, a general pneumatic tire loses the weight of the vehicle when the internal pressure is lost, so that the tire bead part touches the tread part and cannot travel.

Therefore, in the case of general pneumatic tires, when the internal pressure of the tire is lowered, such as puncture, the vehicle control power of the driver is lowered, and in severe cases, the driver's life is threatened.

As described above, in order to prevent the tire from being impossible to run due to a sudden drop in the internal pressure of a tire such as a puncture while driving, a run flat tire that is capable of running even during puncture has been proposed and used.

The run-flat tire refers to a tire configured to run a certain distance at a constant speed even though the sidewall is reinforced than the normal pneumatic tire so that the internal pressure is abnormally lowered.

In the case of run-flat tires with reinforced sidewalls, reinforcement of the reinforced sidewalls by adding roughly crescent-shaped reinforcement rubber (hereinafter referred to as rubber inserts) as sidewalls to reinforce the rigidity of the reinforced sidewalls Under control, have the durability to run a certain distance at a certain speed.

However, due to the added rubber insert, the weight of the tire is increased to reduce rolling resistance and fuel economy performance, and the rigidity of the rubber insert is stronger than that of the rubber of other parts of the tire, thereby causing a problem of deteriorating riding comfort.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a run-flat tire that can improve the riding comfort while maintaining durability at the time of abnormal internal pressure abnormality such as puncture of the run-flat tire.

In the run-flat tire of the present invention for achieving the above object is a run-flat tire that reinforces the inner side of the sidewall portion of the pneumatic tire with a reinforcing member so that the run-flat tire can run when the internal pressure is lowered, the reinforcing member is adjacent to the tread portion A first reinforcing part attached to an inner upper side of the side wall part; A second reinforcement part which is disconnected at a distance from the first reinforcement part and attached to a lower side of the sidewall part adjacent to the bead part; And a third reinforcement part connecting a first reinforcement part and a second reinforcement part interposed between the first reinforcement part and the second reinforcement part in a height direction central portion of the sidewall part, wherein the third reinforcement part is provided in the first reinforcement part. A reinforcing portion and an elastic member having a lower rigidity than the second reinforcing portion is characterized in that the.

Here, the third reinforcement may be formed of a first elastic member having a ring shape so as to be interposed between the first reinforcement member and the second reinforcement member in the circumferential direction of the tire.

The third reinforcement part may further include a plurality of second elastic members inserted through the first elastic member such that both ends thereof contact the first reinforcement part and the second reinforcement part.

In addition, the first elastic member, the second reinforcement part, and the first elastic member of the third reinforcement part may be made of a rubber member, and the second elastic member may be made of a coil spring.

According to the run-flat tire of the present invention as described above, it has the effect of providing a run-flat tire that can improve the riding comfort while maintaining durability when the internal pressure abnormality such as puncture of the run-flat tire is lowered.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

1 is a cross-sectional view of a run-flat tire according to an embodiment of the present invention.

Referring to FIG. 1, the run-flat tire 1 according to the present embodiment has a shoulder portion 20, a side wall portion 30, and a bead portion 40 continuously on both sides of the tread portion 10 in the width direction. Is formed to extend.

In the tread portion 10, the side wall portion 30, and the bead portion 40, a body ply 60 serving as a skeleton of the tire is stacked on the upper side of the inner liner 50 and extends along the width direction. do.

In the tread portion 10, the belt 11, the under tread 15, and the tread 16 are sequentially stacked on the body ply 60.

The belt 11 is a special coded paper located between the body ply 60 and the under tread 15 to mitigate external shocks, and the cracks or trauma generated in the tread 16 are transmitted directly to the body ply 60. To prevent them.

The under tread 15 is used to increase the adhesion between the second belt 13 and the tread 15, and the tread 15 is made of a special rubber material having excellent wear resistance and cutting resistance as a part in direct contact with the road surface. .

In the shoulder portion 20, the thickness gradually decreases and the tread 10 and the side wall portion 30 are connected to each other. A cap ply 21 covering the end of the belt 11 is formed on the belt 11. Lamination is formed.

The cap ply 21 is a special code paper attached to the belt 11 to minimize the movement of the belt 11 when traveling to prevent departure phenomenon during high speed driving.

The side wall portion 30 serves to cover and protect the body ply 60 with a rubber material forming the outer surface of the tire, to support the load of the vehicle and to mitigate the external impact due to the flexing movement.

In the bead part 40, the end 65 of the body ply 60 is turned up so as to surround the bead wire 41 and the apex 42. On the other hand, the turn-up end 66 of the body ply 60 is formed to cover a portion on the outside of the side wall portion 30 adjacent to the bead portion 40.

The bead wire 41 serves to fix and fix the tire to the rim with a wire bundle coated with steel wire with rubber. In addition, the apex 42 prevents the dispersion of the bead wire 41 and mitigates the impact, and prevents air from being generated in the bead portion 40 during molding.

On the other hand, the run-flat tire 1 of the present embodiment as described above to ensure the running stability when the internal pressure of the inner side to the shoulder portion 20 and the bead portion 40 around the side wall portion 30, such as puncture or lower A reinforcing member 100 is provided to make it possible.

However, the present invention is not limited to the pneumatic tire including all of the above configuration, and as long as the reinforcing member 100 may be provided on the inner wall surface of the side wall portion described later to reinforce the side wall portion 30. Naturally, it can be applied in a modified manner.

FIG. 2 is an enlarged cross-sectional view of the sidewall of FIG. 1.

Referring to FIG. 2, the reinforcement member 100 includes a first reinforcement part 110, a second reinforcement part 120, and a third reinforcement part 130, and the first reinforcement part 110. ) And the second reinforcement 120 are fitted between the body ply 60 and the inner liner 70 and are fixed to the inner side of the tire.

The first reinforcement part 110 includes an inner upper side of the side wall part 30 adjacent to the tread part 10, and gradually becomes thinner and arcuately up to the shoulder part 20 bounding the tread part 10. It is formed to extend.

The second reinforcement portion 120 is disconnected at a distance from the lower end of the first reinforcement portion 110, including the lower side wall portion 30 to the bead portion 40 gradually thinner and extend in an arc shape. Is formed.

The third reinforcement part 130 is formed to be interposed between a gap formed between the first reinforcement part 110 and the second reinforcement part 120 at the center of the sidewall part, and the first reinforcement part and the second reinforcement part are formed. It is made of an elastic member having a lower rigidity than the reinforcing portion.

3 is a perspective view illustrating a third reinforcement part illustrated in FIG. 2.

Referring to FIG. 3, in the present exemplary embodiment, the third reinforcement part 130 may further include the first elastic member 131 and the plurality of second elastic members 132 provided in the first elastic member 131. It is configured to include.

The first elastic member 131 forms a ring shape so as to be interposed between the first reinforcing member 110 and the second reinforcing member 120 along the circumferential direction of the tire.

The second elastic member 132 is formed to penetrate through the first elastic member 131 so that both ends thereof contact the first reinforcement 110 and the second reinforcement 120.

In the present embodiment, the first reinforcing part 110, the second reinforcing part 120, and the first elastic member 131 of the third reinforcing part 130 are made of a rubber member, and the third reinforcing part The second elastic member exemplifies a coil spring.

At this time, the rubber insert forming the first reinforcement part 110 and the second reinforcement part 120 has a side wall part 30 so as to support the side wall part 30 so that the tire 1 can maintain the shape of the tire without being distorted when the internal pressure of the tire 1 decreases. It is made of a rubber material having a much higher rigidity than the rubber material forming the rubber layer 31 of the wall portion 30.

In addition, the rigidity of the rubber material constituting the first elastic member 131 of the third reinforcement part 130 and the coil spring constituting the first elastic member 131 may be the first reinforcement part 110 and the second reinforcement part 120. The first reinforcement part 110 and the second reinforcement part 120 are supported to each other to maintain the shape of the tire when the internal pressure is lowered, such as a puncture, and to block vibrations and road impacts generated during driving. It is preferable to have a rigidity smaller than that of the rubber insert forming the reinforcement part 110 and the second reinforcement part 120.

Figure 4 is a side view showing the operating state of the reinforcement portion of the run-flat tire.

As shown in FIG. 4A, when the tire internal pressure (that is, internal air pressure) is constantly maintained, the third reinforcement part 130 is provided through the first reinforcement part 110 adjacent to the tread part when the vehicle is running. By performing the role of a damper to absorb the driving vibration and the road surface shock transmitted to the second reinforcing portion 120 to improve the riding comfort.

However, as shown in FIG. 4B, when the tire internal pressure (that is, internal air pressure) is lowered, such as puncture, the third reinforcement part 130 may have the first reinforcement part 110 and the second reinforcement part. The first elastic member 110 (rubber member) and the second elastic member 132 (coil spring) of the third reinforcement 130 interposed between the 120 are compressed and the first reinforcement 110 is second It is supported by the reinforcement unit 120 so as to have a durability that can run a certain distance at a speed below a certain level in a state in which the tire is not crushed and the vehicle control power is provided.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention. And it goes without saying that they belong to the scope of the present invention.

1 is a cross-sectional view of a run-flat tire according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the sidewall of FIG. 1.

3 is a perspective view illustrating a third reinforcement part illustrated in FIG. 2.

Figure 4 is a side view showing the operating state of the reinforcement portion of the run-flat tire.

<Description of Main Reference Signs>

1: run-flat tire 10: tread portion

20: shoulder portion 30: side wall portion

40: bead part 50: inner liner

60: body fly 100: reinforcement member

110: first reinforcement portion 120: second reinforcement portion

130: third reinforcement 131: first elastic member (rubber member)

132: second elastic member (coil spring)

Claims (5)

In the run-flat tire which reinforces the inside of the sidewall of the pneumatic tire with a reinforcing member so that it can run when the internal pressure drops abnormally, The reinforcing member, A first reinforcing part attached to an inner upper side of the side wall part adjacent to a tread part; A second reinforcement part which is disconnected at a distance from the first reinforcement part and attached to a lower side of the sidewall part adjacent to the bead part; And A third reinforcement part interposed between the first reinforcement part and the second reinforcement part in a height direction central portion of the side wall part; The third reinforcement part, It is made of an elastic member having a lower rigidity than the first reinforcement and the second reinforcement, And a first elastic member having a ring shape so as to be interposed between the first reinforcement part and the second reinforcement part in a circumferential direction of the tire. delete In claim 1, The third reinforcement part, The run-flat tire further includes a plurality of second elastic members inserted through the first elastic member such that both ends thereof contact the first reinforcing portion and the second reinforcing portion. 4. The method of claim 3, The first flat member of the first reinforcing portion, the second reinforcing portion and the third reinforcing portion of the run-flat tire comprising a rubber member. 4. The method of claim 3, And a second elastic member comprising a coil spring.

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